• Transactions of the KSME C: Technology and Education
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• v.2 no.1
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• pp.47-55
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• 2014

A new concept of an Eco-friendly desalination method is introduced in this study. The main idea of the desalination method of seawater is the condensation of the vaporized seawater by solar heat energy on the surface of seashore. The wind turbine blade plays a role of heat exchanger condensing the vaporized water in the air. In this analytical study, the availability of the proposed desalination system was studied. First, an analytical condensation theory of the vaporized water in air was arranged and the parametric study was conducted to estimate the amount of freshwater produced from the system with the change of the temperature difference between the humid air and turbine blade, and the relative humidity in air, and wind speed. From the analytical calculation, 2,927(ton/year) of freshwater was produced at the vertical-type wind turbine (Diameter=4m, Height=3m) as the relative humidity is 100%, the temperature difference between the impeller blade and the humid air is $40^{\circ}C$ and the wind speed is 10m/s.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.465-475
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• 2018

The purpose of this study was to explore predictors of positive changes in children with divorced parents and to demonstrate the structural path among the perceived experience of social discrimination, parenting difficulties, parent-child communication, and internet use of children that related to positive changes based on family incomes. The subjects for this study were 1,114 single parents from divorced families sourced from a study on the status of single-parent families in 2015. The results of this study by using the structural equation model of the moderating effect verification with family incomes and multi group analysis are as follows. First, single-parent's perceived experience of social discrimination turned had a significant positive effect on parenting difficulties( =.354) and children's internet use ( =.234). Single-parent's perceived parenting difficulties also had a significant positive effect on children's internet use ( =.440) but a significant negative effect on both parent-child communication( =.192) and positive changes of children( =.218). Interestingly, internet use of children demonstrated a significant negative effect on their positive changes. Second, parent-child communication, parenting difficulties, and children's internet use had a negative mediating effect with the relationship where single-parent's perceived experience of social discrimination had an effect on positive changes of children( =.167). Second, between the family groups based on family incomes, there was no statistically significant difference in the structural relationship. Based on these results, this study presented a practical proposal to help single parents not experience social discrimination and to help decrease the internet use of children to improve positive changes.

• Korean Journal of Social Welfare
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• v.38
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• pp.309-335
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• 1999

The purpose of this study is to classify welfare regimes using the method of qualitative comparative analysis(QCA). By formalizing the logic of qualitative analysis, QCA makes it possible to bring the logic and empirical intensity of qualitative approaches to studies that normally call for the use of quantitative methods. In QCA each case is conceived holistically, as a configuration of conditions, not a collection of scores on variables. Major findings of this study are as follows. Firstly, major explanations for welfare state differences are partly supported. Indicators relevant to each explanation can appear to be important only if other causal conditions are considered. For example, in the interventionist welfare states, high GDP per capita must be combined with the weakness of the Right and ethnic homogeneity. Otherwise, it can't discern interventionist from liberalist welfare states. Secondly, the equation for the interventionist welfare states includes multiple causal conjunctures. Many studies of welfare state find the same results. The third main finding is that IDV(individualism index) which is proxy for the weakness of informal network matters. Combining with other variables, IDV seems to be important in explaining the emergence of Confucian welfare states.

• Korean Journal of Social Welfare
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• v.51
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• pp.63-91
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• 2002

This article investigates 170 mental health social workers in order to find out the current status and influencing factors on linking services. The social workers of this study work at different kinds of mental health organizations(mental hospitals, mental health centers, mental rehabilitation facilities, mental residential facilities). The result from the research were 1) the degree of linking services is low, and the primary type of coordination is sharing of information and client referrals. The fund-raising and joint project cases are very poor. 2) based on personal and organizational characteristics, there arc significant differences between respondents' sex, education level, job-related status, experience in mental health field, mental health licence(personal factors), location, type of organization, and type of primary client(organizational factors). 3) the factors affecting service coordination among mental health social workers are experience in mental health field, current job-related experience(personal factors), education, location of organization, type of organization, and history of organization(organizational factors). Finally, the research recommends that establishment of cooperation system, service delivery system, and information network is needed in order to enhancing the function of service coordination among mental health social workers. Also, mental health professional associations and agencies should provide opportunity of discussion and training for mental health social workers, and develop the institutional devices to expand the content and type of service coordination.

• Journal of Plant Biotechnology
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• v.35 no.4
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• pp.329-335
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• 2008

Tocopherols are essential lipophilic antioxidant in human cells, while little is known about its function in plant tissues. To study the impact of composition and content of tocopherols on stress tolerance, tobacco (Nicotiana tabacum) was transformed with a construct containing a cDNA insert encoding $\gamma$-tocopherol methyltransferase ($\gamma$-TMT/VTE4) from perilla under the control of the cauliflower mosaic virus (CaMV) 35S promoter. The transgenic tobacco was confirmed by PCR and RT-PCR. The total content and composition of tocopherols in the transgenic lines were similar with wild type controls. However, chlorophyll-a and carotenoid content in the transgenic lines were increased by up to 45% (P<0.01) and 39% (P<0.02), respectively. Also, the over-expression of $\gamma$-TMT increased the salt stress tolerance in tobacco plants. These results demonstrate that over-expression of $\gamma$-TMT gene in tocopherol bio-synthetic pathway can increase salt stress tolerance and contents of chlorophyll-a and carotenoid in transgenic tobacco plants.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.38 no.1
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• pp.79-88
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• 2002

13%Cr martensitic stainless steel has been used mainly with a material for fish pre-processing machinery. However, it has not very nice cutting section because of little of the carbon content. Therefore, SUS420J2 steel that contents 0.3%C with high-strength in spite of the rust is used with a material for fish pre-processing machinery. However, studies on the corrosion characteristics of SUS420J2 steel are relatively rare. Especially, the corrosion phenomenon may cause serious degradation because the fish pre-processing machinery is exposed always to seawater environment. In this paper, the immersion corrosion test was carried out at seawater environment (pH=7.52) on SUS420J2 steel specimens that have various post-treatment conditions and its corrosion characteristics were evaluated. From test results, the specimens such as base metal, vacuum heat treatment, electrolytic polishing and tempering after quenching tend somewhat sensitive from the corrosion. In the case of vacuum heat treatment specimen of continuous immersion during 360 days, the weight loss ratio was high about seven times when compared with the different specimens. On the contrary, SUS420J2 steel specimen that has the heat treatment of tempering after quenching and the electrolytic polishing was less sensitive from the corrosion, and the weight loss ratio was very low.

• The Journal of the Korea Contents Association
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• v.17 no.6
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• pp.86-97
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• 2017

The purpose of this study was to find the mediation effect of job satisfaction between job autonomy and career maturity in high school students. It sampled 849 students who have experienced part-time work. Data were analyzed by regression analysis with SPSS 18.0 version. Results showed significant relationships between socio-economic variables(gender, educational aspiration) and main variables. Females showed higher level of job autonomy, job satisfaction, and career maturity than males' ones. Second, job autonomy was a significant predictor of career maturity by gender and educational aspiration. In addition, job satisfaction proved to have a partial mediating effect on job autonomy and career maturity. Based on the results, this study suggest that adolescents actively participate when they work on the field, and employers have to recognize a role of collaborator about vocational education to increase the career maturity of adolescents. Also, communities and schools have to give adolescents right information on job and make an official system to find a good job.

• Journal of Distribution Research
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• v.8 no.1
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• pp.47-67
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• 2003

The purpose of this study is to investigate three issues. First, we investigated four control mechanisms that might increase the franchisee's perception of franchiser commitment: a franchiser's TSIs, relational norms, monitoring, and qualification programs. Second, we proposed that appropriateness and efficacy of these control mechanisms in fostering franchiser commitment might be changed over the relationship life cycle. Third, we examined how bureaucracy and levels of franchiser's commitment related to relationship satisfaction. Through empirical analysis, research results indicate that a franchiser's TSIs and relational norms are positively associated with the franchisee's perception of franchiser commitment. In detail, what increase franchisee's perception of franchiser commitment in short-term relationship are franchiser's TSIs but relational norms are more important in the long-term relationship. In addition, the results show that franchisee's perception of franchiser commitment, participation and formalization are positively related to relationship satisfaction.

• Journal of Plant Biotechnology
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• v.31 no.1
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• pp.67-72
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• 2004

An efficient protocol has been developed for rapid mass propagation of sweetpotato from shoot-tips derived embryogenic callus. Optimal embryogenic callus was induced from shoot apical meristem explants on Murashige and Skoog (MS) medium supplemented with 1mg/L 2,4-D. The addition of casein hydrolysate in the media increased the embryogenesis efficiency of sweetpotato. Somatic embryos were easily induced from the embryogenic callus on MS basal medium containing 300-500mg/L casein hydrolysate without phytohormon. Treatment of casein hydrolysate (100∼300mg/L) with 1mg/L 2,4-D also improved the secondary embryonic efficiency from somatic embryos below 2mm in length. Plant regeneration was achieved via somatic embryogenesis and direct organogenesis. Regenerated planlets with well developed shoots and roots on MS basal medium were successfully transferred to soil.

• Spatial Information Research
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• v.13 no.1 s.32
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• pp.79-90
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• 2005

The purpose of this study is to estimate quantitatively soil loss and sediment yield in alpine farmland. For this purpose, Naerinchon watershed in Gangwon province was selected as our study area and total annual soil loss and sediment yield was estimated respectively by the Revised Universal Soil Loss Equation (RUSLE) model and the Sediment Delivery Distributed (SEDD) model. The results of this study clearly show that dry field areas have significant impact on the total soil erosion and sediment yield compared with other land use. Dry field areas represent only $2.6\%$ of the total area of the watershed but soil loss and sediment yield account for $10.9\%$ and $33.12\%$ of the total amount respectively Especially as with alpine farmland, this result is more clearly shown. These areas account for $1.8\%$ of the entire watershed but contribute to $7.7\%$ and $15\%$ of the total soil loss and sediment yield respectively. From the above results, we can know that alpine farmland is important source of soil loss and sediment yield and it is need to prevent and control. soil erosion from alpine filmland urgently.